The fan on my oven has started to get really noisy - any ideas? Any handy dhs out there? or handy mums? It is not under guarantee, and call out would be £80 ++ when I am sure it can be easily fixed. Have unscrewed panel to get to it and it doesn't seem to be loose. Put a bit of oil on it which in hindsight wasn't a good idea....lots of smoke!! Don't think I can stand to cook the turkey at this rate. Help...